I won't recommend it. UD100 has plenty of voltage, but it isn't designed to supply a lot of current. Also, with roughly 250ohm of output impedance, you will never get enough dampening. Plus, colouration will likely be a big issue as well.

Again, the output impedance is supposed to be this high on a DAC. The general rule is the input impedance of the amp should be minimum 10x higher, 2.5k ohm in this case. ODAC output impedance is around 500ohm and the recommended input impedance of 5k ohm.

Probably something about your power source and the grounding. Does your computer has any metal? (rims, body, screws?) try touching it and if you can feel some power leak then it's definitely your power source.

iFi Audio iUSB. It provides clean power to your USB peripheral, which in this case the UD100 DAC. I've never tried it myself, however, they boast to have a lower noise floor than a 9V battery.

Try it out and tell us how it performs.

Hey thanks! I have considered adding an USB isolator but it doesn't justify the cost or the size. With that little noise I can just play some music and get away from it. If I am to critically listen to a song or two I'll just unplug the charger.

Just writing it down so people don't panic when their UD100 has some noise.

Hi, I'm currently using the E7 docked to a E9 and was thinking of replacing the E7 with the new Hifimediy sabre dac with isolator. What would you guys think of the this combination with the E9. Will there be any compatablility issue with this combination. I've been following this thread and would appreciate some inputs from you guys which has more experience to help clear my mind. Looks forward to your thoughts. Thanks in advance.Edited by Leo888 - 1/21/13 at 2:35am

Hi, I'm currently using the E7 docked to a E9 and was thinking of replacing the E7 with the new Hifimediy sabre dac with isolator. What would you guys think of the this combination with the E9. Will there be any compatablility issue with this combination. I've been following this thread and would appreciate some inputs from you guys which has more experience to help clear my mind. Looks forward to your thoughts. Thanks in advance.

In your opinion, would the Hifimediy dac be an upgrade or side grade against the E7 solely as a dac. I'm also curious with the difference in the general sound signature between the 2 different dac chips used.The E7 being the only dac I've own and have always felt that it's a little peaky on the highs and would like to improve on this. Do you feel that the Hifimediy dac would give me the result I"m looking for. Lastly, I will appreciate your take in regards to the isolator used in the new Hifimediy dac. How much of a improvement will it gives compared to the older version without the islolator.

Two days ago Stoner Acoustic's last email to me said that they would ship the dac out shortly and update me with the tracking number. I understand that it will take quite some time to make it to my house, but how long did it take them to ship your guys' dacs? I'm fine waiting, I just wanted to know if they tend to ship it out a while before giving the tracking number, just so I can get an idea of when it will be here.

Two days ago Stoner Acoustic's last email to me said that they would ship the dac out shortly and update me with the tracking number. I understand that it will take quite some time to make it to my house, but how long did it take them to ship your guys' dacs? I'm fine waiting, I just wanted to know if they tend to ship it out a while before giving the tracking number, just so I can get an idea of when it will be here.

Took about three weeks for me, from Asia to Europe. Tracking number never worked.